<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>多个选择器</title>
    <style>
        .c1 {
            color: red !important;
            border: 1px solid red;
        }

        .c3 {
            font-size: 25px;
            color: #3A7734;
        }
    </style>
</head>
<body>
<div>
    <span class="c1 c3">今天天气不错的，</span>
    <span class="c1">是风和日丽的</span>
</div>
</body>
</html>